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dune tansy

common tansy

Habit Plants 1.5–5+ dm. Plants 4–15 dm.
Leaves

oblanceolate or elliptic in outline, 3–35 × 2–10 cm;

margins often curled, 2–3-times pinnately lobed;

surfaces villous to woolly, sometimes glabrous;

primary lobes in 6–24 pairs; secondary lobes linear to ovate or obovate.

elliptic in outline, 2–25 × 2–10 cm;

margins usually denticulate, 2-pinnately lobed;

surfaces glabrous or lightly pubescent;

primary lobes in 4–10 pairs; secondary lobes linear to oblanceolate or triangular.

Involucres

4–5 × 8–22+ mm.

3–5 × 5–10 mm.

Ray florets

0–25;

rays 1–6 mm, yellow.

15–25; vestigial, yellow.

Disc florets

corollas 2–2.5 mm, yellow.

corollas 1.5–2 mm, yellow.

Phyllaries

with membranous margins; inner not membranetipped.

with chartaceous margins; inner often membranetipped.

Fruits

2–3 mm, tan;

gland-dotted, 3–5-ribbed, pappi of low crowns or a ring of scales.

1–2 mm, brown, 4–5-ribbed, glabrous or gland-dotted;

pappi 0 or of low crowns.

Heads

2–20+;

peduncles 0.3–12 cm, villous.

20–200;

peduncles 2–15 mm, glabrous or villous.

2n

=54.

=18.

Tanacetum bipinnatum

Tanacetum vulgare

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Dunes, sandy flats, bluffs, grassy slopes. Flowering May–Aug. 0–100 m. Est. CA, WA; north to AK, northeast to New­foundland; Asia, Europe. Native.

Formerly treated as T. camphoratum, this taxon, as well as the related T. huronense, has been combined into T. bipinnatum.

Grasslands, riverbanks, roadsides, disturbed areas. Flowering Jul–Sep. 0–1400 m. BW, Casc, CR, ECas, Sisk, WV. CA, ID, NV, WA; worldwide. Exotic.

Source Flora of Oregon, volume 2, page 360
Kenton Chambers
Flora of Oregon, volume 2, page 360
Kenton Chambers
Sibling taxa
T. balsamita, T. parthenium, T. vulgare
T. balsamita, T. bipinnatum, T. parthenium
Synonyms Tanacetum camphoratum, Tanacetum douglasii
Web links